/*
 * Copyright (c) 2019 The StreamX Project
 * <p>
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.streamxhub.streamx.plugin.profiling.util;

/** @author benjobs */
public class ClassMethodArgument {
  private final String className;
  private final String methodName;
  private final int argumentIndex;

  public ClassMethodArgument(String className, String methodName, int argumentIndex) {
    if (className == null) {
      throw new NullPointerException("className");
    }

    if (methodName == null) {
      throw new NullPointerException("methodName");
    }

    if (argumentIndex < 0) {
      throw new IllegalArgumentException(
          "argumentIndex (must equal or greater than 0: 0 means not collecting argument value, 1 means collecting first argument value)");
    }

    this.className = className;
    this.methodName = methodName;
    this.argumentIndex = argumentIndex;
  }

  public String getClassName() {
    return className;
  }

  public String getMethodName() {
    return methodName;
  }

  public int getArgumentIndex() {
    return argumentIndex;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    ClassMethodArgument that = (ClassMethodArgument) o;

    if (argumentIndex != that.argumentIndex) {
      return false;
    }
    if (className != null ? !className.equals(that.className) : that.className != null) {
      return false;
    }
    return methodName != null ? methodName.equals(that.methodName) : that.methodName == null;
  }

  @Override
  public int hashCode() {
    int result = className != null ? className.hashCode() : 0;
    result = 31 * result + (methodName != null ? methodName.hashCode() : 0);
    result = 31 * result + argumentIndex;
    return result;
  }

  @Override
  public String toString() {
    return "{"
        + "className='"
        + className
        + '\''
        + ", methodName='"
        + methodName
        + '\''
        + ", argumentIndex='"
        + argumentIndex
        + '\''
        + '}';
  }
}
